Unverified Commit 0c2191c3 authored Sep 17, 2020 by Ricardo Ribalda Committed by Mark Brown Sep 17, 2020

regmap: Add support for 12/20 register formatting



Devices such as the AD5628 require 32 bits of data divided in 12 bits
for dummy, command and address, and 20 for data and dummy. Eg:

XXXXCCCCAAAADDDDDDDDDDDDDDDDXXXX

Where X is dont care, C is command, A is address and D is data bits.

Which would requierd the following regmap_config:

static const struct regmap_config config_dac = {
	.reg_bits = 12,
	.val_bits = 20,
	.max_register = 0xff,
};

Signed-off-by: Ricardo Ribalda <ribalda@kernel.org>
Link: https://lore.kernel.org/r/20200917114727.1120373-1-ribalda@kernel.org


Signed-off-by: Mark Brown <broonie@kernel.org>

parent 21f8e482

drivers/base/regmap/regmap.c

+22 −0

Original line number	Diff line number	Diff line
		@@ -209,6 +209,18 @@ static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
		return true;
		}

		static void regmap_format_12_20_write(struct regmap *map,
		unsigned int reg, unsigned int val)
		{
		u8 *out = map->work_buf;

		out[0] = reg >> 4;
		out[1] = (reg << 4) \| (val >> 16);
		out[2] = val >> 8;
		out[3] = val;
		}


		static void regmap_format_2_6_write(struct regmap *map,
		unsigned int reg, unsigned int val)
		{
		@@ -870,6 +882,16 @@ struct regmap __regmap_init(struct device dev,
		}
		break;

		case 12:
		switch (config->val_bits) {
		case 20:
		map->format.format_write = regmap_format_12_20_write;
		break;
		default:
		goto err_hwlock;
		}
		break;

		case 8:
		map->format.format_reg = regmap_format_8;
		break;